package com.gimi.cloud.bbp.client.common.springUtil;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

/**
 * Spring工具类Bean
 * <br/>非@import显式注入，@Component是必须的，且该类必须与main同包或子包
 * <br/>若非同包或子包，则需手动import 注入，有没有@Component都一样
 * @author  luck
 * @date 2017-09-28
 * @version  1.0
 */
@Component
public class SpringUtil implements ApplicationContextAware {

    private static ApplicationContext applicationContext = null;

    /**
     * 初始化ApplicationContext
     * @param applicationContext
     * @throws BeansException
     */
    @Override  
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        if(SpringUtil.applicationContext == null){
            SpringUtil.applicationContext  = applicationContext;
        }  
    }
  
    /**
     * 获取applicationContext
     * @return
     */
    public static ApplicationContext getApplicationContext() {
        return applicationContext;  
    }
    /**
     * 用beanName获取Bean.
     * @param beanName beanName
     * @return
     */
    public static Object getBean(String beanName){
        return getApplicationContext().getBean(beanName);
  
    }

    /**
     * 通过class获取Bean.
     * @param clazz 待获取的Bean类型
     * @param <T>
     * @return 获取结果
     */
    public static <T> T getBean(Class<T> clazz){  
        return getApplicationContext().getBean(clazz);  
    }

    /**
     * 通过name,以及Clazz返回指定的Bean
     * @param name beanName
     * @param clazz beanClass
     * @param <T>
     * @return 获取结果
     */
    public static <T> T getBean(String name,Class<T> clazz){  
        return getApplicationContext().getBean(name, clazz);  
    }  
  
}  